Toru Yajima, Yingying Yu and Masayuki Futamata Steric hindrance in cationic and neutral rhodamine 6 G molecules adsorbed on Au nanoparticles Journal of Raman Spectroscopy 44
Adsorption of R6G molecules on Au nanoparticles was elucidated by surface enhanced Raman scattering. The steric hindrance at hydroethyl amino groups in R6G was evidenced by the observation that R6G+ adsorb on as-prepared gold nanoparticles (AuNPs) only with electrostatic forces in contrast to the electrostatic and chemical adsorption of R123+. It also yielded fewer saturation coverage compared to R123+. Raman bands from phenyl and ethyl substituent are specifically enhanced under an inclined orientation of R6G0 on AuNPs chemisorbed via amino groups.
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